class_docstr: Pretty Printer for vectorialexpressions. 
code: def _print_Derivative(self, deriv):
      from sympy.physics.vector.functions import dynamicsymbols
  
      # XXX use U('PARTIAL DIFFERENTIAL') here ?
      t = dynamicsymbols._t
      dot_i = 0
      syms = list(reversed(deriv.variables))
  
      while len(syms) > 0:
          if syms[-1] == t:
              syms.pop()
              dot_i += 1
          else:
              return super()._print_Derivative(deriv)
  
      if not (
          isinstance(type(deriv.expr), UndefinedFunction)
          and (deriv.expr.args == (t,))
      ):
          return super()._print_Derivative(deriv)
      else:
          pform = self._print_Function(deriv.expr)
  
      # the following condition would happen with some sort of non-standard
      # dynamic symbol I guess, so we'll just print the SymPy way
      if len(pform.picture) > 1:
          return super()._print_Derivative(deriv)
  
      # There are only special symbols up to fourth-order derivatives
      if dot_i >= 5:
          return super()._print_Derivative(deriv)
  
      # Deal with special symbols
      dots = {
          0: "",
          1: "\N{COMBINING DOT ABOVE}",
          2: "\N{COMBINING DIAERESIS}",
          3: "\N{COMBINING THREE DOTS ABOVE}",
          4: "\N{COMBINING FOUR DOTS ABOVE}",
      }
  
      d = pform.__dict__
      # if unicode is false then calculate number of apostrophes needed and
      # add to output
      if not self._use_unicode:
          apostrophes = ""
          for i in range(0, dot_i):
              apostrophes += "'"
          d["picture"][0] += apostrophes + "(t)"
      else:
          d["picture"] = [center_accent(d["picture"][0], dots[dot_i])]
      return pform
  
imports: from sympy.core.function import Derivative
  from sympy.core.function import UndefinedFunction, AppliedUndef
  from sympy.core.symbol import Symbol
  from sympy.interactive.printing import init_printing
  from sympy.printing.latex import LatexPrinter
  from sympy.printing.pretty.pretty import PrettyPrinter
  from sympy.printing.pretty.pretty_symbology import center_accent
  from sympy.printing.str import StrPrinter
  from sympy.printing.precedence import PRECEDENCE
label_desc: Use image node_id 1 for calling the VectorPrettyPrinter obj's underlying member method code with example usage: obj._print_Derivative(deriv) and returns: pform, super, super, super, super